Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2009MOUNTAINEER 4.6 8, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P0552: - POWER STEERING PRESSURE (PSP) SENSOR/SWITCH CIRCUIT LOW
2009 Mercury Mountaineer 4.6 8, RWD
DTC P0552: - Power Steering Pressure (PSP) Sensor/Switch Circuit Low
2009 Mercury Mountaineer 4.6 8, RWDSECTION DTC P0552: - Power Steering Pressure (PSP) Sensor/Switch Circuit Low
DTC P0552: - POWER STEERING PRESSURE (PSP) SENSOR/SWITCH CIRCUIT LOW
| Description: | Indicates the PSP sensor input signal was less than the self-test minimum. | ||
| Possible Causes: |
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| Diagnostic Aids: | View the PSP PID to monitor the PSP input. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test DT . | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.